Denshi Jisho — Online Japanese dictionary

さく 1: (Usually written using kana alone) capsule (moss sporangium);
2: capsule (type of dehiscent fruit)
Noun 
作 さく a work; a harvest
Common word, Noun, Noun suffix 
策 さく plan; policy
Common word, Noun, Noun suffix 
削 さく plane; sharpen; whittle; pare; shave (leather); scrape off; crossout; reduce; curtail
Noun 
昨 さく last (year); yesterday
Prefix 
朔 さく 1: new moon;
2: first day of the lunar month;
3: (in ancient China) next year's calendar and decrees (distributed by the Emperor at year's end)
Noun 
柵 さく fence; paling
Noun 
爵 さく 1: jue (ancient 3-legged Chinese wine pitcher, usu. made of bronze);
2: peerage (hereditary title bestowed by the emperor)
Out-dated or obsolete kana, Noun 
簀 さく mat (made of pieces of split bamboo or reeds tied together)
Noun 
索 さく rope; cord
Noun 
割く さく 1: to cut up; to cleave; to cut open (esp. the abdomen);
2: to spare (time, money, etc.); to use part of something;
3: (Archaism) to have a tattoo in the corner of one's eye
Common word, Godan verb with ku ending, Transitive verb 
咲く さく to bloom
Common word, Godan verb with ku ending, Intransitive verb 
裂く さく 1: to tear; to rip up;
2: to cut up; to cleave; to cut open (esp. the abdomen);
3: to forcibly separate (i.e. two lovers);
4: (Archaism) to have a tattoo in the corner of one's eye
Common word, Godan verb with ku ending, Transitive verb 
避く さく to avoid
Godan verb with ku ending, Transitive verb 
さくい 1: friendly; sociable;
2: brittle; fragile; light
Adjective 
さくっ 1: (Onomatopoeic or mimetic word) with a crunching or grinding sound;
2: quickly; promptly; abruptly; simply; efficiently;
3: crispily; crunchily
Adverb taking the 'to' particle 
サクッ 1: (Onomatopoeic or mimetic word) with a crunching or grinding sound;
2: quickly; promptly; abruptly; simply; efficiently;
3: crispily; crunchily
Adverb taking the 'to' particle 
桜 さくら 1: cherry tree; cherry blossom;
2: decoy; fake buyer; shill;
3: hired applauder;
4: (Colloquialism) horse meat
Common word, Noun 
櫻 さくら 1: cherry tree; cherry blossom;
2: decoy; fake buyer; shill;
3: hired applauder;
4: (Colloquialism) horse meat
Out-dated kanji, Noun 
昨日 きのう yesterday
Common word, Adverbial noun, Temporal noun 
錯誤 さくご mistake
Common word, Noun 
作詞 さくし (writing) song lyrics
Common word, Noun, Suru verb 
昨夜 さくや last night
Common word, Adverbial noun, Temporal noun 
昨夜 ゆうべ last night
Common word, Adverbial noun, Temporal noun 
作意 さくい idea; design; motif; conception; intention
Noun 
作為 さくい 1: artificiality;
2: act; commission (of a crime)
Noun, Suru verb 
昨夏 さくか last summer; summer of last year
Noun 

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